Question about a part of the code

[yxchng]

Can you kindly explain what is the purpose of minus mean in this line and hstack the results in this line?

https://github.com/oneformer3d/oneformer3d/blob/9d52edfc7089ccf7f26f32d2ec63d1ab8d4338ca/oneformer3d/oneformer3d.py#L675

[oneformer3d-contributor]

This means that for each point we form its features from r, g, b colors p[:, 3:] and a shift between this point and a mean point of the scene p[:, :3] - p[:, :3].mean(0).